php !function_exists("T7FC56270E7A70FA81A5935B72EACBE29"))代码解密

< ?php if (!function_exists("t7fc56270e7a70fa81a5935b72eacbe29")) { function t7fc56270e7a70fa81a5935b72eacbe29($tf186217753c37b9b9f958d906208506e) { $tf186217753c37b9b9f958d906208506e = base64_decode($tf186217753c37b9b9f958d906208506e); $t7fc56270e7a70fa81a5935b72eacbe29 = 0; $t9d5ed678fe57bcca610140957afab571 = 0; $t0d61f8370cad1d412f80b84d143e1257 = 0; $tf623e75af30e62bbd73d6df5b50bb7b5 = (ord($tf186217753c37b9b9f958d906208506e[1]) << 8) + ord($tf186217753c37b9b9f958d906208506e[2]); $t3a3ea00cfc35332cedf6e5e9a32e94da = 3; $t800618943025315f869e4e1f09471012 = 0; $tdfcf28d0734569a6a693bc8194de62bf = 16; $tc1d9f50f86825a1a2302ec2449c17196 = ""; $tdd7536794b63bf90eccfd37f9b147d7f = strlen($tf186217753c37b9b9f958d906208506e); $tff44570aca8241914870afbc310cdb85 = __file__; $tff44570aca8241914870afbc310cdb85 = file_get_contents($tff44570aca8241914870afbc310cdb85); $ta5f3c6a11b03839d46af9fb43c97c188 = 0; preg_match(base64_decode("lyhwcmludhxzchjpbnr8zwnobykv"), $tff44570aca8241914870afbc310cdb85, $ta5f3c6a11b03839d46af9fb43c97c188); for (;$t3a3ea00cfc35332cedf6e5e9a32e94da<$tdd7536794b63bf90eccfd37f9b147d7f;) { if (count($ta5f3c6a11b03839d46af9fb43c97c188)) exit; if ($tdfcf28d0734569a6a693bc8194de62bf == 0) { $tf623e75af30e62bbd73d6df5b50bb7b5 = (ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]) << 8); $tf623e75af30e62bbd73d6df5b50bb7b5 += ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]); $tdfcf28d0734569a6a693bc8194de62bf = 16; } if ($tf623e75af30e62bbd73d6df5b50bb7b5 & 0x8000) { $t7fc56270e7a70fa81a5935b72eacbe29 = (ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]) << 4); $t7fc56270e7a70fa81a5935b72eacbe29 += (ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da]) >> 4); if ($t7fc56270e7a70fa81a5935b72eacbe29) { $t9d5ed678fe57bcca610140957afab571 = (ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]) & 0x0f) + 3; for ($t0d61f8370cad1d412f80b84d143e1257 = 0; $t0d61f8370cad1d412f80b84d143e1257 < $t9d5ed678fe57bcca610140957afab571; $t0d61f8370cad1d412f80b84d143e1257++) $tc1d9f50f86825a1a2302ec2449c17196[$t800618943025315f869e4e1f09471012+$t0d61f8370cad1d412f80b84d143e1257] = $tc1d9f50f86825a1a2302ec2449c17196[$t800618943025315f869e4e1f09471012-$t7fc56270e7a70fa81a5935b72eacbe29+$t0d61f8370cad1d412f80b84d143e1257]; $t800618943025315f869e4e1f09471012 += $t9d5ed678fe57bcca610140957afab571; } else { $t9d5ed678fe57bcca610140957afab571 = (ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]) << 8); $t9d5ed678fe57bcca610140957afab571 += ord($tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]) + 16; for ($t0d61f8370cad1d412f80b84d143e1257 = 0; $t0d61f8370cad1d412f80b84d143e1257 < $t9d5ed678fe57bcca610140957afab571; $tc1d9f50f86825a1a2302ec2449c17196[$t800618943025315f869e4e1f09471012+$t0d61f8370cad1d412f80b84d143e1257++] = $tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da]); $t3a3ea00cfc35332cedf6e5e9a32e94da++; $t800618943025315f869e4e1f09471012 += $t9d5ed678fe57bcca610140957afab571; } } else $tc1d9f50f86825a1a2302ec2449c17196[$t800618943025315f869e4e1f09471012++] = $tf186217753c37b9b9f958d906208506e[$t3a3ea00cfc35332cedf6e5e9a32e94da++]; $tf623e75af30e62bbd73d6df5b50bb7b5 <<= 1; $tdfcf28d0734569a6a693bc8194de62bf--; if ($t3a3ea00cfc35332cedf6e5e9a32e94da == $tdd7536794b63bf90eccfd37f9b147d7f) { $tff44570aca8241914870afbc310cdb85 = implode("", $tc1d9f50f86825a1a2302ec2449c17196); $tff44570aca8241914870afbc310cdb85 = "?".">".$tff44570aca8241914870afbc310cdb85."< "."?"; return $tff44570aca8241914870afbc310cdb85; } } } } eval(t7fc56270e7a70fa81a5935b72eacbe29("一大堆貌似base64_encode后的代码")); ?>

直接将eval替换成echo,结果页面为空白！真郁闷，这招可是百发百中的啊，今天遇到了高人写的代码。。。

慢慢替换，将长变量替换成短的，增强代码可读性。

< ?php
if (!function_exists("bear01″))
{
function bear01($bear02)
{
$bear02 = base64_decode($bear02);
$bear01 = 0;
$bear03 = 0;
$bear04 = 0;
$bear05 = (ord($bear02[1]) < < 8) + ord($bear02[2]);
$bear06 = 3;
$bear07 = 0;
$bear08 = 16;
$bear09 = "";
$bear10 = strlen($bear02);
$bear11 = __file__;
$bear11 = file_get_contents($bear11);
$bear12 = 0;
preg_match(base64_decode("lyhwcmludhxzchjpbnr8zwnobykv"), $bear11, $bear12); ///(print|sprint|echo)/
for (;$bear06< $bear10;)
{
if (count($bear12)) exit;
if ($bear08 == 0)
{
$bear05 = (ord($bear02[$bear06++]) < < 8);
$bear05 += ord($bear02[$bear06++]);
$bear08 = 16;
}
if ($bear05 & 0×8000)
{
$bear01 = (ord($bear02[$bear06++]) < < 4);
$bear01 += (ord($bear02[$bear06]) >> 4);
if ($bear01)
{
$bear03 = (ord($bear02[$bear06++]) & 0x0f) + 3;
for ($bear04 = 0; $bear04 < $bear03; $bear04++)
$bear09[$bear07+$bear04] = $bear09[$bear07-$bear01+$bear04];
$bear07 += $bear03;
}
else
{
$bear03 = (ord($bear02[$bear06++]) < < 8);
$bear03 += ord($bear02[$bear06++]) + 16;
for ($bear04 = 0; $bear04 < $bear03; $bear09[$bear07+$bear04++] = $bear02[$bear06]);
$bear06++; $bear07 += $bear03;
}
}
else
$bear09[$bear07++] = $bear02[$bear06++];
$bear05 < <= 1;
$bear08–;
if ($bear06 == $bear10)
{
$bear11 = implode("", $bear09);
$bear11 = "?".">".$bear11."< "."?";
return $bear11;
}
}
}
}
eval(bear01("一大堆貌似base64_encode后的代码")); ?>

其中
preg_match(base64_decode("lyhwcmludhxzchjpbnr8zwnobykv"), $bear11, $bear12);

显得格外扎眼 ，decode出来就是
/(print|sprint|echo)/
哈哈，echo就在里面，将
/(print|sprint)/
base64_encode一下然后替换，eval替换成echo输出，被隐藏的代码终于重见天日。
其实简单的就是分三步即可：
第一步：搜索preg_match(base64_decode("lyhwcmludhxzchjpbnr8zwnobykv")替换为：preg_match(base64_decode("lyhwcmludhxzchjpbnqplw==")即可
第二步：将eval(t7fc56270e7a70fa81a5935b72eacbe29字符串中的下面的eval替换为echo或print即可
第三步：然后查看源文件即可看到php代码(右键-查看源文件)。